That seems like such a narrow subset.
That IMO is where VR glasses are actually a pretty good fit. Carry lightweight laptop through the airport and still get to use a 32” monitor on the go. Granted the current hardware not exactly ideal, but it’s close enough to be a reasonable option.
Also, I think we can all agree the form factor is likely to improve over time. Portable displays meanwhile have inherent limitations in use ie an airline seat.